package com.shiyi.shiyiaicodefather.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.StrUtil;
import com.mybatisflex.core.query.QueryWrapper;
import com.mybatisflex.spring.service.impl.ServiceImpl;
import com.shiyi.shiyiaicodefather.exception.BusinessException;
import com.shiyi.shiyiaicodefather.exception.ErrorCode;
import com.shiyi.shiyiaicodefather.model.dto.user.UserQueryRequest;
import com.shiyi.shiyiaicodefather.model.entity.User;
import com.shiyi.shiyiaicodefather.mapper.UserMapper;
import com.shiyi.shiyiaicodefather.model.enums.UserRoleEnum;
import com.shiyi.shiyiaicodefather.model.vo.LoginUserVO;
import com.shiyi.shiyiaicodefather.model.vo.UserVO;
import com.shiyi.shiyiaicodefather.service.UserService;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

import static com.shiyi.shiyiaicodefather.constant.UserConstant.USER_LOGIN_STATE;

/**
 * 用户 服务层实现。
 *
 * @author 十一
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User>  implements UserService {

  @Override
  public long userRegister(String userAccount, String userPassword, String checkPassword) {
    // 1. 校验
    if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
    }
    if (userAccount.length() < 4) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
    }
    if (userPassword.length() < 8 || checkPassword.length() < 8) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
    }
    if (!userPassword.equals(checkPassword)) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入的密码不一致");
    }
    // 2. 检查是否重复
    QueryWrapper queryWrapper = new QueryWrapper();
    queryWrapper.eq("userAccount", userAccount);
    long count = this.mapper.selectCountByQuery(queryWrapper);
    if (count > 0) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
    }
    // 3. 加密
    String encryptPassword = getEncryptPassword(userPassword);
    // 4. 插入数据
    User user = new User();
    user.setUserAccount(userAccount);
    user.setUserPassword(encryptPassword);
    user.setUserName("无名");
    user.setUserRole(UserRoleEnum.USER.getValue());
    boolean saveResult = this.save(user);
    if (!saveResult) {
      throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
    }
    return user.getId();
  }

  @Override
  public String getEncryptPassword(String userPassword) {
    // 盐值，混淆密码
    final String SALT = "yupi";
    return DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
  }

  @Override
  public LoginUserVO getLoginUserVO(User user) {
    if (user == null) {
      return null;
    }
    LoginUserVO loginUserVO = new LoginUserVO();
    BeanUtil.copyProperties(user, loginUserVO);
    return loginUserVO;
  }

  @Override
  public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
    // 1. 校验
    if (StrUtil.hasBlank(userAccount, userPassword)) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
    }
    if (userAccount.length() < 4) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号错误");
    }
    if (userPassword.length() < 8) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "密码错误");
    }
    // 2. 加密
    String encryptPassword = getEncryptPassword(userPassword);
    // 查询用户是否存在
    QueryWrapper queryWrapper = new QueryWrapper();
    queryWrapper.eq("userAccount", userAccount);
    queryWrapper.eq("userPassword", encryptPassword);
    User user = this.mapper.selectOneByQuery(queryWrapper);
    // 用户不存在
    if (user == null) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或密码错误");
    }
    // 3. 记录用户的登录态
    request.getSession().setAttribute(USER_LOGIN_STATE, user);
    // 4. 获得脱敏后的用户信息
    return this.getLoginUserVO(user);
  }

  @Override
  public User getLoginUser(HttpServletRequest request) {
    // 先判断是否已登录
    Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
    User currentUser = (User) userObj;
    if (currentUser == null || currentUser.getId() == null) {
      throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
    }
    // 从数据库查询（追求性能的话可以注释，直接返回上述结果）
    long userId = currentUser.getId();
    currentUser = this.getById(userId);
    if (currentUser == null) {
      throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
    }
    return currentUser;
  }

  @Override
  public boolean userLogout(HttpServletRequest request) {
    // 先判断是否已登录
    Object userObj = request.getSession().getAttribute(USER_LOGIN_STATE);
    if (userObj == null) {
      throw new BusinessException(ErrorCode.OPERATION_ERROR, "未登录");
    }
    // 移除登录态
    request.getSession().removeAttribute(USER_LOGIN_STATE);
    return true;
  }


  @Override
  public UserVO getUserVO(User user) {
    if (user == null) {
      return null;
    }
    UserVO userVO = new UserVO();
    BeanUtil.copyProperties(user, userVO);
    return userVO;
  }

  @Override
  public List<UserVO> getUserVOList(List<User> userList) {
    if (CollUtil.isEmpty(userList)) {
      return new ArrayList<>();
    }
    return userList.stream().map(this::getUserVO).collect(Collectors.toList());
  }

  @Override
  public QueryWrapper getQueryWrapper(UserQueryRequest userQueryRequest) {
    if (userQueryRequest == null) {
      throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
    }
    Long id = userQueryRequest.getId();
    String userAccount = userQueryRequest.getUserAccount();
    String userName = userQueryRequest.getUserName();
    String userProfile = userQueryRequest.getUserProfile();
    String userRole = userQueryRequest.getUserRole();
    String sortField = userQueryRequest.getSortField();
    String sortOrder = userQueryRequest.getSortOrder();
    return QueryWrapper.create()
      .eq("id", id)
      .eq("userRole", userRole)
      .like("userAccount", userAccount)
      .like("userName", userName)
      .like("userProfile", userProfile)
      .orderBy(sortField, "ascend".equals(sortOrder));
  }

}
